The only option to think about is disk layout but you only have six of them.
This isn't enough for "optimum performance"
A RAID 1 volume with 2 disks will be around 135GB so if your database is 100GB+ you'd need RAID5/RAID 10 with 4 disks, but then you don't have enough for separate logs/OS/Tempdb volumes. As an aside, with 100GB+ DB why only 16GB RAM? (this will be 12GB for SQL Server cache)
If you have high write volumes then you'd need a separate log drive, again RAID 1.
Tempdb is best with it's own volumes too. And OS/binaries. And local backup unless you have a fast network to backup to.
But, with just 6 disks I'd go for a single RAID 10 using all 6 disks as per this question:
Help me choose a RAID level combination for a SQL Server 2008 instance
With more disks then you can consider something discussed here:
SQL Server configuration / specification recommendations and advice!
Note, these are not strict rules: it depends on your database load and sizes
Optimum and cheap don't go together when buying servers...